18 gallon Poly Fuel Tank for 67 Gladiator

[mikekids3]

Just received the new poly 18 gallon fuel tank for my 67 Gladiator and it has a threaded hole on the top corner opposite the fill and vent holes. What is suppose to go in the hole? I don't see anything in the instruction label to tell me??
thanks



Mike

[Ryan]

that is for a check valve / breather if desired. If you don't hook that up, it would need to be plugged and you'll want to use a vented gas cap